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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include "ifw.h"
#include "ifw_dbus.h"
#include "ipset.h"
static int init(plugin_t *plugin, DBusConnection *connection);
static void deinit(plugin_t *plugin, DBusConnection *connection);
static void process_attack(plugin_t *plugin, DBusConnection *connection, int seq, msg_usr_t *attack);
static DBusHandlerResult handle_message(DBusConnection *connection, DBusMessage *message, plugin_t *plugin);
#ifdef IFW_FAKE
static int generate_fake_attack(msg_usr_t *attack);
static void handle_fake(plugin_t *plugin, DBusConnection *connection);
#else
static void handle_incoming(plugin_t *plugin, DBusConnection *connection);
#endif
static int init(plugin_t *plugin, DBusConnection *connection) {
ifw_t *ifw;
ifw = malloc(sizeof(ifw_t));
if (!ifw) {
fprintf(stderr, "unable to malloc ifw\n");
return -1;
}
report_list_init(&ifw->reports);
black_list_init(&ifw->blacklist);
white_list_init(&ifw->whitelist);
white_list_load(&ifw->whitelist, IFW_WHITELIST_FILENAME);
ifw->mode = IFW_MODE_INTERACTIVE;
#ifdef IFW_FAKE
plugin->fd = 0;
#else
plugin->fd = nl_ifw_create_socket();
if (plugin->fd < 0) {
fprintf(stderr, "unable to init netlink\n");
return -1;
}
#endif
ifw_dbus_notify_clear(connection);
ifw_dbus_notify_init(connection);
plugin->priv = (void *) ifw;
return 0;
}
static void deinit(plugin_t *plugin, DBusConnection *connection) {
ifw_t *ifw = (ifw_t *) plugin->priv;
ifw_dbus_notify_clear(connection);
close(plugin->fd);
}
#ifdef IFW_FAKE
#include <time.h>
static int generate_fake_attack(msg_usr_t *attack) {
static int seq = 0;
uint32_t addr = 0xC0A86401;
time(&attack->timestamp_sec);
strcpy(attack->indev_name, "ppp0");
attack->sensor = 0;
attack->protocol = 0;
attack->icmp_type = 0;
attack->d_port = 0;
attack->s_addr = htonl(addr);
switch(seq%3) {
case 0:
strcpy(attack->prefix, "SCAN");
break;
case 1:
strcpy(attack->prefix, "SERV");
attack->d_port = 22;
break;
case 2:
strcpy(attack->prefix, "PASS");
break;
}
addr++;
seq++;
return seq;
}
static void handle_fake(plugin_t *plugin, DBusConnection *connection) {
msg_usr_t fake_attack;
int seq;
read(0, NULL, 1);
seq = generate_fake_attack(&fake_attack);
printf("seq : %d\n", seq);
process_attack(plugin, connection, seq, &fake_attack);
}
#else
static void handle_incoming(plugin_t *plugin, DBusConnection *connection) {
struct nl_msg msg;
static int seq = 0;
msg_usr_t attack;
if (nl_ifw_read_msg(plugin->fd, NULL, &msg) <= 0) {
fprintf(stderr, "unable to read packet from netlink\n");
return;
}
attack.timestamp_sec = msg.timestamp_sec;
strncpy(attack.indev_name, msg.indev_name, IFNAMSIZ);
strncpy(attack.prefix, (char *) msg.prefix, PREFSIZ);
attack.sensor = 0;
attack.protocol = msg.ip.protocol;
attack.s_addr = msg.ip.saddr;
switch (msg.ip.protocol) {
case IPPROTO_TCP:
attack.d_port = msg.h.th.dest;
break;
case IPPROTO_UDP:
attack.d_port = msg.h.uh.dest;
break;
default:
attack.d_port = 0;
break;
}
attack.icmp_type = 0;
process_attack(plugin, connection, seq++, &attack);
}
#endif
static void process_attack(plugin_t *plugin, DBusConnection *connection, int seq, msg_usr_t *attack) {
ifw_t *ifw = (ifw_t *) plugin->priv;
report_list_cell_t *report;
if (black_list_find(&ifw->blacklist, attack->s_addr) ||
white_list_find(&ifw->whitelist, attack->s_addr) ||
report_list_find(&ifw->reports, attack->s_addr, 0)) {
struct in_addr addr;
addr.s_addr = attack->s_addr;
fprintf(stderr, "skipping known address: %s\n", inet_ntoa(addr));
return;
}
if (!strcmp(attack->indev_name, "lo")) {
fprintf(stderr, "skipping loopback interface\n");
return;
}
report = report_list_add(&ifw->reports, seq, attack);
if (report) {
if (ifw->mode == IFW_MODE_AUTO) {
/* add ip address in ipset blacklist */
ifw_dbus_apply_report_verdict(connection, ifw, report, 1);
}
/* notify the attack to frontends */
ifw_dbus_notify_attack(connection, report);
}
black_list_print(&ifw->blacklist);
white_list_print(&ifw->whitelist);
report_list_print(&ifw->reports);
}
static DBusHandlerResult handle_message(DBusConnection *connection, DBusMessage *message, plugin_t *plugin) {
ifw_t *ifw = (ifw_t *) plugin->priv;
if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "GetMode")) {
return ifw_dbus_get_mode(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "SetMode")) {
return ifw_dbus_set_mode(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "GetReports")) {
return ifw_dbus_get_reports(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "GetBlacklist")) {
return ifw_dbus_get_blacklist(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "SetBlacklistVerdict")) {
return ifw_dbus_set_blacklist_verdict(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "UnBlacklist")) {
return ifw_dbus_unblacklist(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "GetWhitelist")) {
return ifw_dbus_get_whitelist(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "Whitelist")) {
return ifw_dbus_whitelist(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "UnWhitelist")) {
return ifw_dbus_unwhitelist(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "ClearProcessedReports")) {
return ifw_dbus_clear_processed_reports(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "SendAlertAck")) {
return ifw_dbus_send_alert_ack(connection, message, ifw);
} else if (dbus_message_is_method_call(message, IFW_DBUS_INTERFACE, "SendManageRequest")) {
return ifw_dbus_send_manage_request(connection, message, ifw);
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
plugin_t ifw_plugin = {
.name = "Interactive Firewall",
.path = IFW_DBUS_PATH,
.init = init,
#ifdef IFW_FAKE
.handle_incoming = handle_fake,
#else
.handle_incoming = handle_incoming,
#endif
.handle_message = handle_message,
.deinit = deinit,
};
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